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Photography is NOT a spectator sport. As useful as sitting on your couch watching workout videos, this series is not meant to be read through from the comfort of your computer chair. Pause. Do the exercises. Evaluate your progress. Mess up. Get dirty.
Sharpness is vital to professional photographers who make large prints, but beginners probably will not notice much of a difference between a razor-sharp photo that they view on a computer screen compared to a fairly-sharp photo that they view on a computer screen. Nonetheless, photographers are crazy about sharpness, and I am too.